eisseria meningitidis, a human-specific pathogen, is a gram-negative, aerobic, non endospore forming [12] diplococcus of the Proteobacteria phylum (see Figure 1)[7]. This nonmotile, yet piliated [12] bacterium is enveloped with a carbohydrate capsule [13] that is covered with and distinguished by the polysaccharides attached to its surface, and is targeted by the host’s immune system. N.meningitidis is one of the three main bacteria that causes acute bacterial meningitis, along with Streptococcus pneumoniae and Haemophilus influenzae